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JSON Formatter & Validator
Paste messy JSON, check that it is valid, then pretty-print or minify it. Everything runs locally.
About this tool.
JSON is the most common format for moving data between web apps and APIs, and a single missing comma or quote breaks the whole document. This formatter parses your input with the browser's own JSON engine, so the validation is the same one your code will meet in production, and the error message points to the problem.
Format adds two-space indentation so nested objects are readable. Minify strips all whitespace to shrink payloads for configs, URLs and storage. Because nothing is sent to a server, it is safe to paste internal API responses.
Three steps, then you are done.
Paste your JSON
Drop raw or minified JSON into the input box.
Format or minify
Choose Format for readable output or Minify for the smallest size.
Copy the result
Copy the output, or read the error message and fix the input.
Questions about this tool.
Is my JSON uploaded anywhere?
No. Parsing happens in your browser and nothing is transmitted.
Why is my JSON invalid?
Common causes are trailing commas, single quotes instead of double quotes, and unquoted keys.
Does it support comments?
No. Standard JSON does not allow comments, so remove them before validating.
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